1.

यदि `1/(a+b)=1/b+1/b`, तो `a^(3)-b^(3)` का मान क्या होगा?A. 3B. 2C. 1D. 0

Answer» Correct Answer - D
`1/(a+b) =1/a+1/b`
`1/(a+b)=(b+a)/(ab)`
`ab=a^(2)+b^(2)+2ab`
`a^(2)+b^(2)+ab=0`
`a^(3)-b^(3)=(a-b)(a^(2)+b^(2)+ab)`
`=(a-b)(0)=0`


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